Elevator system comprising deflecting elements having different groove geometries

Abstract

An elevator system includes a car and/or a counterweight connected to a belt having a plurality of ribs. The elevator system further has at least two deflecting elements over which the belt is guided and which each have a plurality of grooves. The grooves of at least one of the deflecting elements are configured with geometries that differ from the grooves of another of the deflecting elements. The belt has longitudinal ribs that cooperate with the grooves.

Claims

1. An elevator system including a car and/or a counterweight, a belt supporting the car and/or the counterweight, a first deflecting element over which the belt is guided, and a second deflecting element over which the belt is guided, comprising: the belt includes a plurality of tension-bearing elements running in a longitudinal direction of the belt and a sheath in which the tension-bearing elements are embedded; the belt has a first side and a second side opposite the first side, wherein the belt is guided with the first side over both the first deflecting element and the second deflecting element; at least the first side of the belt has a plurality of ribs running in the longitudinal direction of the belt; each of the first and second deflecting elements has a plurality of grooves with which the ribs of the first side of the belt mesh; and wherein the grooves of the first deflecting element have a first geometry in cross-section, and the grooves of the second deflecting element have a second geometry in cross-section different from the first geometry, the cross-sections being transverse to the longitudinal direction of the belt when the ribs are meshed with the grooves.

2. The elevator system according to claim 1 wherein the first deflecting element is a roller or a disc.

3. The elevator system according to claim 1 wherein the second deflecting element is a roller or a disc.

4. The elevator system according to claim 1 wherein the first deflecting element is a roller and the second deflecting element is a traction sheave of a motor for moving the car and/or the counterweight.

5. The elevator system according to claim 1 wherein the first geometry and the second geometry are configured such that a traction between the second deflecting element and the belt is greater than a traction between the first deflecting element and the belt.

6. The elevator system according to claim 1 wherein the grooves of the second deflecting element each have an undercut formed therein, and the grooves of the first deflecting element are configured without an undercut.

7. The elevator system according to claim 1 wherein the grooves of the second deflecting element include a coating or a tissue that increases a friction coefficient of the second deflecting element.

8. The elevator system according to claim 1 wherein a cross-section of each of the ribs of the belt is arch-shaped, circle-segment-shaped, semicircular, or ellipse segment-shaped.

9. The elevator system according to claim 1 wherein at least a portion of each of the grooves of at least one of the first deflecting element and the second deflecting element is complementary in shape to a shape of the ribs of the belt.

Description

DESCRIPTION OF THE DRAWINGS

(1) The drawings show in:

(2) FIG. 1 a schematic, highly simplified depiction of an elevator system;

(3) FIG. 2 a sectional view of a belt according to a first embodiment;

(4) FIG. 3 a section of a first deflecting element of the elevator system according to FIG. 1;

(5) FIG. 4 a section of a second deflecting element of the elevator system according to FIG. 1;

(6) FIG. 5 a sectional view of a belt according to a second embodiment;

(7) FIG. 6 a sectional view of a belt according to a third embodiment; and

(8) FIG. 7 a sectional view of a belt according to a fourth embodiment.

DETAILED DESCRIPTION

(9) FIG. 1 shows a schematic, highly simplified depiction of an elevator system 100. The elevator system 100 has an elevator car 102 and a counterweight 104, which are supported by a belt 10. In this case, the belt 10 is guided over a plurality of deflecting elements. There are two types of deflecting elements. On the one hand, they are rollers 108, 110, and 112, over which the belt is guided. On the other hand, the belt 10 is guided over a traction sheave 114 of a motor 116, over which the belt 10 can be moved in its longitudinal direction. As a result, the position of the elevator car 102 and the counterweight 104 within the elevator shaft of the elevator system 100 can be changed. In order to ensure that the belt can be guided over all deflecting elements with the one running side, the belt is subject to half a longitudinal rotation by 180° between two deflecting elements deflecting in the opposite direction. In the drawing, such a twist occurs between the roller 108 and the traction sheave 114, as well as between the traction sheave 114 and the roller 110.

(10) FIG. 2 shows a sectional view of the belt 10 of the elevator system 100 according to FIG. 1.

(11) The belt 10 has a plurality of tension-bearing elements 12 running in the longitudinal direction of the belt 10, and their longitudinal axes lie in a common center plane 14.

(12) The tension-bearing elements 12 are particularly cables, preferably steel cables. Alternatively, they can also be fiber ropes.

(13) The tension-bearing elements 12 are embedded in a sheath 16 which completely surrounds the tension-bearing elements 12 and which particularly comprises a polymer.

(14) The belt 10 has a first side 18 and a second side 20 opposite the first side, wherein, on the first side 18, a plurality of ribs 22 is provided, whose geometry is formed such that, in the profile, they have a semicircular cross-section with a flattened tip.

(15) FIG. 3 shows a section of a first deflecting element 30, the running surface 32 of which has a plurality of grooves 34. Once again, these grooves 34 have a first geometry, which is also semi-segment-shaped with flattened bottoms and thus designed to be complementary to the geometry of the ribs 22 of the belt 10.

(16) The groove geometry shown in FIG. 3 is used particularly for all rollers 108 to 112 of the elevator system 100, at which no traction force has to be transmitted, i.e., particularly for all rollers 108 to 112 with the exception of the traction sheave 114.

(17) FIG. 4 shows a section of a second deflecting element 40, which also has a plurality of grooves 44 on its running surface 42, which have a second geometry deviating from the first geometry of the grooves 34 of the first deflecting element 30. This second geometry is particularly designed such that the profile of the grooves 44 is also semicircular, but on the bottom side, an undercut 46 is provided in each case. Particularly the first and the second geometry are thus designed largely identical with the exception of said undercuts 46.

(18) Said second geometry, which is shown in FIG. 4, is particularly the geometry of the grooves, which is used in the traction sheave 114.

(19) The undercuts achieve a local normal force increase, thereby increasing the traction capacity, and so great forces can be transmitted from the traction sheave to the belts, which are necessary for moving the car 102 and the counterweight 104. The grooves 44 of the second deflecting element 40 have at least to some extent a coating 48 or a tissue 48 that increases the friction coefficient.

(20) On the other hand, the first geometry of the first deflecting element 30, i.e., particularly all rollers 108 to 112 with the exception of the traction sheaves 114, is advantageous because the belt 10 is less damaged by this geometry and the risk of a belt jump in the event of transverse traction to the belt 10 is reduced.

(21) FIG. 5 shows a sectional view of a belt 50 according to a second embodiment. Unlike the belt according to the first embodiment according to FIG. 2, the semicircular ribs have no flattening at their tips.

(22) FIG. 6 shows a sectional view of a belt 60 according to a third embodiment, wherein ellipse segment-shaped ribs are provided instead of semicircular ribs.

(23) In particular, the geometries of the grooves 34, 44 of the deflecting elements 30, 40 are once again designed to be essentially complementary to the geometry of the ribs of the belts 50 and 60, with the exception that the second deflecting element 40 is again provided with undercuts 46.

(24) FIG. 7 shows a sectional view of a belt 70 according to a fourth embodiment. In the belt 70, an equal number of ribs 72 and 74 are provided both on the first side 18 and on the second side 20, wherein the geometries of the ribs 72, 74, however, differ from one another on the two sides 18, 20. This ensures that, depending on which side 18, 20 and thus which rib geometry is in contact with the grooves of a deflecting element, different force transmission properties are achieved. With this belt, the twist between two opposingly deflecting ones of the deflecting elements can be foregone.

(25) In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.

LIST OF REFERENCE SIGNS

(26) 10, 50, 60, 70 Belts 12 Tension-bearing elements 14 Center plane 16 Sheath 18, 20 Side 22, 72, 74 Rib 30, 40 Deflecting element 32, 42 Running surface 34, 44 Groove 46 Undercut 48 Coating or tissue 100 Elevator system 102 Car 104 Counterweight 108, 110, 112 Roller 114 Traction sheave 116 Motor